Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
Which of the following combinations of conditions may increase the rate of a chemical reaction?
Decrease in temperature, increase in concentration of the reactants
Increase in temperature, addition of a catalyst, decrease in the surface area of the reactants
Increase in temperature, increase in concentration, addition of a catalyst and increase in the surface area of the reactants
Decrease in temperature concentration and surface area of the reactants
Additionof a catalyst and in the absence of light
Correct answer is C
Increase in temperature, increase in concentration, increase the rate of chemical reaction
40 g
20 g
10 g
4 g
2 g
Correct answer is D
No explanation has been provided for this answer.
0.5
1.0
2.0
3.0
4.0
Correct answer is B
No explanation has been provided for this answer.
H2SO4
AgNO3
HNO3
NH3
HCl
Correct answer is B
No explanation has been provided for this answer.
When copper powder is heated with concentrated sulphuric acid, the gas produced is?
hydrogen sulphide
sulphur dioxide
sulphur trioxide
hydrogen pentasulphide
sulphur pentoxide
Correct answer is B
No explanation has been provided for this answer.